For the last two days I’ve noticed my guppy sitting motionless on the gravel in the morning. It’s worrying because all the other fish are swimming around by this time as it’s getting lighter. I tried shining a torch light on him this morning or putting the fish tank light on and whilst the rest all started swimming more he’s still sat still. This is totally unexpected. My tank is cycling but I am far into the cycle not at the beginning. The tanks been set up around 4/5 weeks. I have 7 male guppies that were added in two goes. They are in a 10g, this is totally unexpected. I look after my fish well, I use salt minerals to raise the hardiness of the water at the moment. The tank has water changes of around 50-70% per week. Sometimes less if peramters are more stable. I must say an odd factor about this guppy is that he has a curved back unlike the rest who look pretty normal. What would others recommend? I am really worried. Any help is appreciated. Thank you.